Optimize dumpsym maximum memory usage
This took ages to track down. Turns out GHC keeps references to all loaded ModIfaces in the PackageInterfaceTable in ExternalPackageState for caching. ExternalPackageState is in an IORef in HscEnv so overwriting that with a copy from right after init improves things a bit. Next I use unsafeInterleaveIO to load the ModIfaces as we serialize the symbol table rather than before thus reducing the amount of memory needed even more.
This commit is contained in:
Daniel Gröber
parent
84fa5f89cf
commit
89b1ac2d1e
@ -1,4 +1,4 @@
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{-# LANGUAGE CPP, BangPatterns, DoAndIfThenElse #-}
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{-# LANGUAGE CPP, BangPatterns, DoAndIfThenElse, TupleSections #-}
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module Language.Haskell.GhcMod.Find
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#ifndef SPEC
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@ -18,6 +18,20 @@ module Language.Haskell.GhcMod.Find
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#endif
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where
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import Control.Applicative
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import Control.Monad
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import Control.Exception
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import Control.Concurrent
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import Data.List
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import Data.Binary
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import Data.ByteString (ByteString)
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import Data.IORef
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import qualified Data.ByteString.Lazy as LBS
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import qualified GHC as G
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import FastString
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import Module
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import OccName
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import HscTypes
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import Language.Haskell.GhcMod.Convert
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import Language.Haskell.GhcMod.Gap
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import Language.Haskell.GhcMod.Monad
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@ -26,35 +40,36 @@ import Language.Haskell.GhcMod.PathsAndFiles
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import Language.Haskell.GhcMod.Types
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import Language.Haskell.GhcMod.Utils
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import Language.Haskell.GhcMod.World
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import Language.Haskell.GhcMod.Target
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import Language.Haskell.GhcMod.LightGhc
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import qualified GHC as G
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import Name
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import Module
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import Exception
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import Control.Applicative
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import Control.Monad
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import Control.Monad.Trans.Control
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import Control.Concurrent
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import Data.Function
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import Data.List
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import Data.Map (Map)
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import qualified Data.Map as M
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import System.Directory
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import System.Directory.ModTime
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import System.FilePath ((</>))
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import System.IO
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import System.IO.Unsafe (unsafeInterleaveIO)
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import Prelude
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import Data.Map.Strict (Map)
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import qualified Data.Map.Strict as M
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import Data.Set (Set)
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import qualified Data.Set as S
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----------------------------------------------------------------
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-- | Type of function and operation names.
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type Symbol = String
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type Symbol = ByteString
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type ModuleNameBS = ByteString
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-- | Database from 'Symbol' to \['ModuleString'\].
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data SymbolDb = SymbolDb
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{ table :: Map Symbol [ModuleString]
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{ table :: Map Symbol [ModuleNameBS]
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, symbolDbCachePath :: FilePath
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} deriving (Show)
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}
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isOutdated :: IOish m => SymbolDb -> GhcModT m Bool
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isOutdated db =
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@ -64,18 +79,18 @@ isOutdated db =
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-- | Looking up 'SymbolDb' with 'Symbol' to \['ModuleString'\]
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-- which will be concatenated. 'loadSymbolDb' is called internally.
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findSymbol :: IOish m => Symbol -> GhcModT m String
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findSymbol :: IOish m => String -> GhcModT m String
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findSymbol sym = do
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tmpdir <- cradleTempDir <$> cradle
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loadSymbolDb tmpdir >>= lookupSymbol sym
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-- | Looking up 'SymbolDb' with 'Symbol' to \['ModuleString'\]
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-- which will be concatenated.
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lookupSymbol :: IOish m => Symbol -> SymbolDb -> GhcModT m String
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lookupSymbol sym db = convert' $ lookupSym sym db
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lookupSymbol :: IOish m => String -> SymbolDb -> GhcModT m String
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lookupSymbol sym db = convert' $ lookupSym (fastStringToByteString $ mkFastString sym) db
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lookupSym :: Symbol -> SymbolDb -> [ModuleString]
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lookupSym sym db = M.findWithDefault [] sym $ table db
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lookupSym sym db = map (ModuleString . unpackFS . mkFastStringByteString) $ M.findWithDefault [] sym $ table db
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---------------------------------------------------------------
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@ -85,14 +100,12 @@ loadSymbolDb dir = do
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ghcMod <- liftIO ghcModExecutable
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readProc <- gmReadProcess
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file <- liftIO $ chop <$> readProc ghcMod ["dumpsym", dir] ""
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!db <- M.fromAscList . map conv . lines <$> liftIO (readFile file)
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!db <- M.fromList . decode <$> liftIO (LBS.readFile file)
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return $ SymbolDb
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{ table = db
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, symbolDbCachePath = file
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}
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where
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conv :: String -> (Symbol, [ModuleString])
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conv = read
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chop :: String -> String
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chop "" = ""
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chop xs = init xs
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@ -107,19 +120,21 @@ loadSymbolDb dir = do
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dumpSymbol :: IOish m => FilePath -> GhcModT m String
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dumpSymbol dir = do
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create <- (liftIO . isOlderThan cache) =<< timedPackageCaches
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runGmPkgGhc $ do
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when create $
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liftIO . writeSymbolCache cache =<< getGlobalSymbolTable
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pkgOpts <- packageGhcOptions
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when create $ liftIO $ do
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withLightHscEnv pkgOpts $ \env -> do
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writeSymbolCache cache =<< getGlobalSymbolTable env
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return $ unlines [cache]
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where
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cache = dir </> symbolCacheFile
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writeSymbolCache :: FilePath
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-> [(Symbol, [ModuleString])]
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-> Map Symbol (Set ModuleNameBS)
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-> IO ()
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writeSymbolCache cache sm =
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void . withFile cache WriteMode $ \hdl ->
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mapM (hPrint hdl) sm
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LBS.hPutStr hdl (encode sm)
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-- | Check whether given file is older than any file from the given set.
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-- Returns True if given file does not exist.
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@ -133,28 +148,30 @@ isOlderThan cache files = do
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return $ any (tCache <=) $ map tfTime files -- including equal just in case
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-- | Browsing all functions in all system modules.
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getGlobalSymbolTable :: LightGhc [(Symbol, [ModuleString])]
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getGlobalSymbolTable = do
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df <- G.getSessionDynFlags
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let mods = listVisibleModules df
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moduleInfos <- mapM G.getModuleInfo mods
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return $ collectModules
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$ extractBindings `concatMap` (moduleInfos `zip` mods)
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getGlobalSymbolTable :: HscEnv -> IO (Map Symbol (Set ModuleNameBS))
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getGlobalSymbolTable hsc_env =
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foldM (extend hsc_env) M.empty $ listVisibleModules $ hsc_dflags hsc_env
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extractBindings :: (Maybe G.ModuleInfo, G.Module)
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-> [(Symbol, ModuleString)]
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extractBindings (Nothing, _) = []
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extractBindings (Just inf, mdl) =
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map (\name -> (getOccString name, modStr)) names
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where
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names = G.modInfoExports inf
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modStr = ModuleString $ moduleNameString $ moduleName mdl
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extend :: HscEnv
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-> Map Symbol (Set ModuleNameBS)
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-> Module
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-> IO (Map Symbol (Set ModuleNameBS))
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extend hsc_env mm mdl = do
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eps <- readIORef $ hsc_EPS hsc_env
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modinfo <- unsafeInterleaveIO $ runLightGhc hsc_env $ do
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G.getModuleInfo mdl <* liftIO (writeIORef (hsc_EPS hsc_env) eps)
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collectModules :: [(Symbol, ModuleString)]
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-> [(Symbol, [ModuleString])]
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collectModules = map tieup . groupBy ((==) `on` fst) . sort
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where
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tieup x = (head (map fst x), map snd x)
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return $ M.unionWith S.union mm $ extractBindings modinfo mdl
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extractBindings :: Maybe G.ModuleInfo
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-> G.Module
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-> Map Symbol (Set ModuleNameBS)
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extractBindings Nothing _ = M.empty
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extractBindings (Just inf) mdl = M.fromList $ do
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name <- G.modInfoExports inf
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let sym = fastStringToByteString $ occNameFS $ G.getOccName name
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mdls = S.singleton $ fastStringToByteString $ moduleNameFS $ moduleName mdl
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return (sym, mdls)
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----------------------------------------------------------------
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